Environmental conditions and oceanographic features, in relation to the location and the timing of spawning of fish species, can greatly affect the management of fishery by influencing both the variation in stock size and the complexity of the population structure. These physicochemical processes, aligned with biological processes, act upon the recruitment and post-recruitment of small palagics such as sardines and anchovies. This project will be carried out over a period of three years and fieldwork surveys will be undertaken for two years. The area for this project has been selected for its oceanographic complexity and its importance as a spawning and nursery ground for anchovy.
The main objectives of ANREC are to advance the understanding of the recruitment of small pelagic fishes (anchovy) in relation to physical and biological forcing and to improve the capability of predicting the effects of environmental and biological variability and the change on such recruitment. To achieve these objectives, the project will include a multi-level sampling in three ontogenetic stages of anchovy (larvae, juveniles, adults), and the online and remote monitoring of the events. The scientific innovation will be realised from a multi-disciplinary study of several key parameters, such as the environmental impact on anchovy recruitment and the importance of the post-recruitment processes.
Progress to Date
It was agreed that two sets of data would be provided: a) the sea-surface temperature (SST) data and b), the phytoplankton pigment concentration data (Chlorophyll-a). It was decided that oceanological, metereological and hydrolocical data should be collected for every station in order to divide the whole area into sub-areas that may be linked with the success of the early life stage of anchovy. Samples for genetic analysis will be taken from the area from anchovy eggs, juvenile and adults and fisheries landings' data will be collected from the main ports of the area for the duration of the project. The market price of anchovy, fishing fleet movements and anchovy imports in the area will be examined as well.
The grid has been perfected so that physical data will be recorded (temperature, salinity, dissolved oxygen, density) in all the stations and in half of them samples for chemical analysis will be collected (nutrients and chlorophyll-a), as well as larval samples for biological analysis.
After the second meeting, preparative work was undertaken about the collection and analysis of historical data concerning the hydrology, meteorology and oceanography of the area. Hydrologic data (river water discharge and quality time-series) from the Rivers Nestos and Evros were analysed and simple ARIMA models for short and medium-term prediction were established. Historic meteorological data and CTD data from previous projects were collected and a relative database was developed. Remote sensing data concerning sea surface temperature and surface chlorophyll were recorded and raw data values at selected positions in the area of interest were extracted as a time-series. Retrospective analysis will attempt to combine the above historical datasets and determine the spatial and temporal patterns of the area.
By studying the Thracian anchovy stock, we intend:
1) to provide new insights into the major sub-processes within the recruitment and post-recruitment processes and the physical and biologically induced changes that affect them
2) to improve the capability in predicting the results of these changes on this anchovy stock
3) to evaluate the effects of these changes on the anchovy fishery in the area
4) to provide the decision makers with inputs necessary for the management of the species
5) to propose management plans based on all the above.
FISHERIES AND AQUACULTURE
Scientist responsible for the project
Dr ARGYRIS KALLIANIOTIS
640 07 KAVALA
Greece - GR
Phone: +30 2594022691
Fax: +30 2594022222
||National Agricultural Research Foundation
||10 January 2002
||1 849 009 €
|Total EC contribution
||1 299 947 €